Which of the following statements is false regarding the characteristics of Rickettsias?
A. They are obligate intracellular parasites.
B. They are the cause of Rocky Mountain Spotted Fever.
C. They belong to class Alphaproteobacteria.
D. They use glucose as an energy source.
Answer: D
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Which of the following statements about mycorrhizae is correct?
A. Endomycorrhizal fungi constitute a monophyletic group. B. The hyphae of ectomycorrhizal fungi penetrate plant root cells. C. Endomycorrhizal fungi provide plant roots with nutrients, whereas ectomycorrhizal fungi do not. D. Endomycorrizal fungi receive carbohydrates from plants, whereas ectomycorrhizal fungi do not. E. Endomycorrhizal fungi branch extensively in the soil surrounding plant roots, whereas ectomycorrhizal fungi do not.
When bacteria are exposed to nutrient-poor conditions, they form thick-walled structures that contain the chromosome and a small amount of cytoplasm. These structures are called
A. plasmids. B. pseudomonads. C. nucleoids. D. endospores. E. exospores.
A ________ is a sperm-killing chemical that is more effective as a contraceptive when used in combination with a condom or diaphragm
Fill in the blank(s) with correct word
How is nevirapine used to treat HIV infections?
a. It decreases the virus's ability to find host cells. b. It increases the immune system's ability to detect the virus. c. It alters the active site of reverse transcriptase, decreasing that enzyme's activity. d. It binds to the active site of HIV reverse transcriptase, decreasing that enzyme's activity.